Piezoelectric vibrator, surface-mounting type piezoelectric vibrator, oscillator, electronic apparatus and wave clock

Abstract

A piezoelectric vibrator has an airtight terminal including leads each having a plane portion. A vibrating piece includes a first part having a preselected thickness and a second part having a thickness smaller than the preselected thickness. The plane portion of each of the leads is connected to the second part of the vibrating piece. A case covers a periphery of the vibrating piece and is sealed on an outer circumference of the airtight terminal.

1. A piezoelectric vibrator comprising:
 an airtight terminal having two leads; 
 a vibrating piece connected to the leads; and 
 a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight terminal; 
 wherein a level difference is provided in a mount part of the vibrating piece fixed to the leads. 
 
   
   
     2. A piezoelectric vibrator according to  claim 1 ; wherein the depth of the level difference is 20% or more and 70% or less of the thickness of the vibrating piece. 
   
   
     3. A piezoelectric vibrator according to  claim 1 ; wherein the level difference is provided at two places of one side of the vibrating piece. 
   
   
     4. A piezoelectric vibrator according to  claim 1 ; wherein the level difference is provided at each one place of both sides of the vibrating piece, respectively, and is connected to interpose the vibrating piece between the two leads. 
   
   
     5. A piezoelectric vibrator according to  claim 1 ; wherein a center of a line segment connecting a line diameter center of each of the two leads is eccentric from a central axis of the airtight terminal in the piezoelectric vibrator. 
   
   
     6. An oscillator comprising: an oscillating device and a piezoelectric vibrator according to  claim 1  connected to the oscillating device. 
   
   
     7. An electronic apparatus comprising: a timing unit and a piezoelectric vibrator according to  claim 1  connected to the timing unit. 
   
   
     8. A wave clock comprising: a filter unit and a piezoelectric vibrator according to  claim 1  connected to the filter unit. 
   
   
     9. A piezoelectric vibrator comprising:
 an airtight terminal having a plurality of leads, each of the leads having a plane portion; 
 a vibrating piece comprised of a first part having a preselected thickness and a second part having a thickness smaller than the preselected thickness, the plane portion of each of the leads being connected to the second part of the vibrating piece; and 
 a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight terminal. 
 
   
   
     10. A piezoelectric vibrator according to  claim 9 ; wherein the thickness of the second part of the vibrating piece is 30% or more and 80% or less of the thickness of the first part of the vibrating piece. 
   
   
     11. A piezoelectric vibrator according to  claim 9 ; wherein the second part is formed to have a level difference only in one side of the vibrating piece. 
   
   
     12. A piezoelectric vibrator according to  claim 9 ; wherein the second part is formed to have a level difference in respective sides of the vibrating piece and is connected to interpose the vibrating piece between the two leads. 
   
   
     13. A piezoelectric vibrator according to  claim 9 ; wherein a center of a line segment connecting a line diameter center of each of the two leads is eccentric from a central axis of the airtight terminal in the piezoelectric vibrator. 
   
   
     14. A piezoelectric vibrator comprising:
 an airtight terminal having a plurality of leads, each of the leads having an end face; 
 a vibrating piece comprised of a mount part having a plurality of notched portions each having an end face, the end faces of the leads being connected to and disposed in abutment with the respective end faces of the notched portions; and 
 a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight. 
 
   
   
     15. A piezoelectric vibrator according to  claim 14 ; wherein each of the leads has a plane portion in a side face thereof, the plane portions of the leads interposing the vibration piece. 
   
   
     16. A surface-mounting type piezoelectric vibrator comprising:
 a mold resin covering a surface of a piezoelectric vibrator; and 
 an external electrode terminal partially exposed from the mold resin; 
 wherein the piezoelectric vibrator comprises an airtight terminal having two leads, a vibrating piece connected to the leads, and a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight terminal, and 
 wherein a level difference is provided in a mount part of the vibrating piece fixed to the leads. 
 
   
   
     17. An oscillator comprising: an oscillating device and a surface-mounting type piezoelectric vibrator according to  claim 16  connected to the oscillating device. 
   
   
     18. An electronic apparatus comprising: a timing unit and a surface-mounting type piezoelectric vibrator according to  claim 16  connected to the timing unit. 
   
   
     19. A surface-mounting type piezoelectric vibrator comprising:
 a piezoelectric vibrator comprised of an airtight terminal with a plurality of leads each having a plane portion, a vibrating piece, and a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight terminal, the vibrating piece comprising a first part having a preselected thickness and a second part having a thickness smaller than the preselected thickness, the plane portion of each of the leads being connected to the second part of the vibrating piece; 
 a mold resin covering a surface of the piezoelectric vibrator; and 
 an external electrode terminal partially exposed from the mold resin. 
 
   
   
     20. A surface-mounting type piezoelectric vibrator comprising:
 a piezoelectric vibrator comprised of an airtight terminal with a plurality of leads each having a plane portion, a vibrating piece, and a case covering a periphery of the vibrating piece and sealed on an outer circumference of the airtight terminal, the vibrating piece comprising a mount part having a plurality of notched portions each having an end face, the end faces of the leads being connected to and disposed in abutment with the respective end faces of the notched portions; 
 a mold resin covering a surface of the piezoelectric vibrator; and 
 an external electrode terminal partially exposed from the mold resin.